I've been having an issue lately. I start music playback and all seems fine. However if I leave the app at all it wont load back up again. The music continues to play however I can't open Plex to control playback. Attempting to open Plex gets me as far as a black screen then sends me back to Start. The system media controls also do nothing. The only way to stop playback is to play something from another app. This happens both over mobile data and wifi at home. I've restarted the phone, and reinstalled the app.
Cheers,
Dean